package chapter06;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet(urlPatterns = "/CircleServlet")
public class CircleServlet extends HttpServlet{
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String s = request.getParameter("radius");
        double radius = Double.parseDouble(s);
        Circle c = new Circle();
        c.setRadius(radius);
//        c.setArea(3.14 * r * r);
//        System.out.println("圆面积是："+c.getArea());
        out.println("圆面积是：" + c.getArea());
    }
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        doGet(req, resp);
    }
}